Service Manuals, User Guides, Schematic Diagrams or docs for : . Electronic Components Datasheets Various SG6841_SYSTEMGENERAL
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Product Specification
High-integrated Green-mode PWM Controller SG6841
FEATURES DESCRIPTION
Green-mode PWM to support "Blue Angel" Norm This highly integrated PWM controllers, SG6841 series,
Low start up current 30uA provides several features to enhance the performance of
Low operation current 3mA low power flyback converters. To minimize standby
Leading-edge blanking power consumption, the proprietary green-mode
Built-in synchronized slope compensation function provides off-time modulation to linearly
Constant output power limit for universal AC input decrease the switching frequency under light-load
Current mode operation conditions. This green-mode function assists the power
Cycle-by-cycle current limiting supply to easily meet the power conservation
Under voltage lockout (UVLO) requirement. Due to BiCMOS process, the start-up
Programmable PWM frequency current and operation current is reduced to 30uA and
GATE output maximum voltage clamped at 18V 3mA, respectively, to improve power conversion
Totem pole output includes soft driving for better efficiency. Large start-up resistance can be used for
EMI further power saving. Built-in synchronized slope
Build-in limited-power-control to meet safety compensation ensures the stability of peak current mode
requirement control. A proprietary internal compensation ensures
Programmable over-temperature protection constant output power limit for universal AC input
Few external components & low cost solution voltage from 90VAC to 264VAC.
SG6841 provides many protection functions.
APPLICATIONS Pulse by pulse current limit ensures a constant output
General-purpose switching mode power supplies current under short circuit. If a short circuit failure or
and flyback power converters, and over load happens, the SG6841 will shut off after a
continuous high voltage detection on FB pin. The gate
Power Adapter
output is clamped at 18V to protect the power MOS
Open-frame SMPS
from over voltage damage. An external NTC
Battery Charger Adapter
thermistor can be applied to sense the ambient
temperature for over-temperature protection. The
SG6841 series are available in 8-pin DIP and SO
packages.
TYPICAL APPLICATION
From bridge rectifier
127~ 373VDC D1 From auxiliary
winding
RIN C IN
VIN VDD
RT Rg
Q1
GATE
RA
RI SG6842
RT SENSE
RI RS
FB
GND
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